diff --git a/tests/ApiTest.php b/tests/ApiTest.php
index d46453f..5570f01 100644
--- a/tests/ApiTest.php
+++ b/tests/ApiTest.php
@@ -74,11 +74,15 @@ public function testCreateSubscriber()
         $this->assertEquals('john.doe@example.org', $response['email']);
     }
 
+    /**
+     * @depends testCreateSubscriber
+     */
     public function testGetSubscriber()
     {
+        $groupId = getenv('GROUP_ID');
         $response = self::$apiManager->getSubscriber(
             'john.doe@example.org',
-            getenv('GROUP_ID')
+            $groupId
         );
 
         $this->assertArrayHasKey('email', $response);
@@ -86,7 +90,7 @@ public function testGetSubscriber()
 
         $response = self::$apiManager->getSubscriber(
             'jane.doe@example.org',
-            getenv('GROUP_ID')
+            $groupId
         );
 
         $this->assertArrayHasKey('error', $response);
@@ -101,11 +105,15 @@ public function testGetSubscriber()
         );
     }
 
+    /**
+     * @depends testCreateSubscriber
+     */
     public function testSetSubscriberStatus()
     {
+        $groupId = getenv('GROUP_ID');
         $response = self::$apiManager->setSubscriberStatus(
             'john.doe@example.org',
-            getenv('GROUP_ID'),
+            $groupId,
             true
         );
 
@@ -113,7 +121,7 @@ public function testSetSubscriberStatus()
 
         $response = self::$apiManager->getSubscriber(
             'john.doe@example.org',
-            getenv('GROUP_ID')
+            $groupId
         );
 
         $this->assertArrayHasKey('active', $response);
@@ -121,7 +129,7 @@ public function testSetSubscriberStatus()
 
         $response = self::$apiManager->setSubscriberStatus(
             'john.doe@example.org',
-            getenv('GROUP_ID'),
+            $groupId,
             false
         );
 
@@ -129,25 +137,28 @@ public function testSetSubscriberStatus()
 
         $response = self::$apiManager->getSubscriber(
             'john.doe@example.org',
-            getenv('GROUP_ID')
+            $groupId
         );
 
         $this->assertArrayHasKey('active', $response);
         $this->assertFalse($response['active']);
     }
 
+    /**
+     * @depends testCreateSubscriber
+     */
     public function testDeleteSubscriber()
     {
         $response = self::$apiManager->deleteSubscriber(
             'john.doe@example.org',
-            getenv('GROUP_ID')
+            $groupId
         );
 
         $this->assertTrue($response);
 
         $response = self::$apiManager->deleteSubscriber(
             'jane.doe@example.org',
-            getenv('GROUP_ID')
+            $groupId
         );
 
         $this->assertArrayHasKey('error', $response);